Bulletin d’avalanche

Jasper

Apr 24 – 25, 2013Parks Canada
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Archivé · expiré 13 years ago

Danger d’avalanche

Fri
Sat
Alpin
2 · Modéré
Limite forestière
1 · Faible
Sous la limite
1 · Faible
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Points saillants

The avalanche danger will rise both rapidly and significantly once the melt freeze crust has melted. This process will occur earlier in the day if the crust does not refreeze well overnight, if it rains or with prolonged intense solar radiation.

Problèmes avalancheux

  • Wind Slabs

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–3
    Isolated pockets of wind slab can be found on lee aspects in exposed alpine terrain near ridge crests. Expect to encounter this condition on most aspects due to recent variable wind directions. Poorly bonded slabs on solar crusts are likely.

  • Cornices

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Unlikely - Possible
    Taille
    2–3
    It is that time in the spring when warmer daytime temperatures combined with milder overnight temperatures will make cornices more susceptible to collapsing. They seem larger this year and may still trigger deep instabilities on north aspects.

  • Loose Wet

    • Alpin
    • Limite forestière
    • Sous la limite forestière
    Probabilité
    Possible
    Taille
    1–2
    Cool temperatures and limited direct solar radiations will preserve the melt freeze crust in most locations until mid afternoon. Once gone the avalanche danger will increase rapidly.

Weather Forecast

A South and Westerly flow will persist until Friday. Precipitation will be limited to flurries and the chance of light rain at lower elevations. The overnight temperatures will alow for refreezing of the melt freeze crust. Freezing levels during the afternoon will reach upper treeline and should the sun come out crustal breakdown may occur earlier.

Snowpack Summary

A spring temperature crust up to 15cm thick can be found near the top of the snowpack. This crust has been found as high as 2600m in the Icefields area. In places it is buried under several inches of new snow. Wind slabs can be found at upper elevations on most aspects due to varied wind direction patterns. Cornices are large and ready to drop.

Avalanche Summary

No recent avalanche activity has been reported today. Cooler temperatures and limited solar radiation due to cloud cover has reduced natural activity in the last few days.

Confidence

Forecast snowfall amounts are uncertain

Régions couvertes